Răspuns :
1.(2x+15)/3=17
2x+15=51
2x=51-15
2x=36
x=18.proba: (2*18+15)=51, 36+15=51,51=51.
2.a+b+c=370.
a=2b=2*3c=6c
c=b/3, b=3c
6c+3c+c=370
10c=370
c=37
b=3*37
b=111
a=2*111
a=222.proba:222+37+111=370. Sper ca te-am ajutat!
2x+15=51
2x=51-15
2x=36
x=18.proba: (2*18+15)=51, 36+15=51,51=51.
2.a+b+c=370.
a=2b=2*3c=6c
c=b/3, b=3c
6c+3c+c=370
10c=370
c=37
b=3*37
b=111
a=2*111
a=222.proba:222+37+111=370. Sper ca te-am ajutat!
[tex]1.\\
a->numarul~necunoscut\\
(a* 2 + 15) : 3 = 17\\
2a + 15 = 17 * 3\\
2a = 51 - 15\\
2a = 36\\
a = 36 : 2\\
a = 18[/tex]
2.a+b+c=37-
a=2b
c=b:3 deci b=3c
inlocuim asa:
2b+b+c=370
2x3c+3c+c=370 => 6c+3c+c=370
10c=370
c=37
b=3x37 b=111
a=111x2
a=222
3.a+b+c+d+e+f+g=171
a
b=a-7
c=b-7=a-7-7=a-14
d=c-7=a-7-7-7=a-21
e=d-7=a-7-7-7-7=a-28
f=e-7=a-7-7-7-7-7=a-35
a+a-7+a-14+a-21+a-28+a-35=171
6a=171+7+14+21+28+35=276
a=276/6=46
46-7 =39
46-14=32
46-21=25
46-28=18
46-35=11
verificare 11+18+25+32+39+46=171
2.a+b+c=37-
a=2b
c=b:3 deci b=3c
inlocuim asa:
2b+b+c=370
2x3c+3c+c=370 => 6c+3c+c=370
10c=370
c=37
b=3x37 b=111
a=111x2
a=222
3.a+b+c+d+e+f+g=171
a
b=a-7
c=b-7=a-7-7=a-14
d=c-7=a-7-7-7=a-21
e=d-7=a-7-7-7-7=a-28
f=e-7=a-7-7-7-7-7=a-35
a+a-7+a-14+a-21+a-28+a-35=171
6a=171+7+14+21+28+35=276
a=276/6=46
46-7 =39
46-14=32
46-21=25
46-28=18
46-35=11
verificare 11+18+25+32+39+46=171